Bending-rolls.



. Noj. 877,038. PATENTED JAN. 21, 1908.

o. A. Bzzn'rscm BENDING ROLLS. APPLICATION FILED JUNE 22, 1907.

W Inventor I I Attorney ST TES PATEnT onnron. A

CHARLES A. BEBTSGEL' or OAMBRIDGEICITY, INDIANA BENnmenoLLs.

Cambridge City, .Wayne county, Indiana,

elevation of the head end of the machine,. i par 1 1g. 3 an elevation of the tail end of themalrlave invented; certainnew and useful Improvements in Bending-Rolls, of which the isa- 'specification. .5. stood frorni 'the following description taken in connectionfwith the accompanying drawing in whieh:

' Figure 1 is'a'frontelevati-on. part vertical section, inthe plane of line a of Fig. 3 Fig. 2

section in the plane of line a of Fig. 1:

gchme: Fig. 4a lan of the tail end of the blending roll ant one-pinching roll in the plane of line I; of Fig. 2: and Fig. 5 a vertical transverse section in the plane of line 0 of' Fi I 1. i 'nthedrawinigt-l, indicates the .head

housing: Zfthe ta ,7 housing: 3, the top pinching roll: 4, the bottom pinching roll: 5, the bend ng roll r 6, the extension shaft of the top pinchin roll: 7, the outboard'of the exiillSlOli shaft; 8, the buckle-bearing for the tail end of the top pinching roll: 9, the pivot.

at the lower end of the buckle-bearing: and 30, the latch for holding the buckle-bearing to normal position. All of the parts thus far referred to are of ordinary construction and arrangement and subject to the usual modi- 1 --iications. i

"Proceeding with the drawing:11, indigiifc'ates the toe of'the buckle-bearing, the same formmg an extension generally inward from the pivot of the buckle-bearing and carrying I a series of rollers with their axes parallel with ."4O

the axis of the pivot of the buckle-bearing, this series of rollers being arranged as a curve forming vin effect a roller cam increasing in distance outward from the pivot of the buckle-bearing: '12, a heavy lever pivoted to the head housing and having its long arm in I osition to be engaged by the rollers of the ,huckle-bearing toe when the buckle-bearing is tu'rned downward: 13,-a link connecting the short arm oflever 12 with the outboard bearing of the extension shaft: l4, a 5 ring acting tensiona'llybetween'the buckleearing and lever 12 in such-manner as to yieldingl resistthe outward swinglng ofthe Ibuc e-bearing: '15, an anti-friction lever lying below and parallel with the lower pinching roll: 16, a saddle provided w1th two Specification of Letters "Patent. Application fiaa June 22.1907. Serial 1%. 380.267.

-. improved rolls will be; readily under Patented Jan. 21, 1908.

rollers and carried by the short arm (if lever 1 5-, th1s saddle engaging under the lower inchm roll atabout its mid-length: 17, a

ink, ,0 adjustable le'n th, connecting the long arm of lever 12 wit the long arm of le-' ver 15: 18, the driving gear on the extension shaft of the top pinching roll to receive power fordriving the machine in the usual manner: 19, a pinion fast on the top pinching roll: 20, a pinion loose on the lowerpinching roll :v 21, a riction clamp in the form of a disk coming against the outer face of inion 20 and servmg to frictionally clamp the pinion to its roll: 22,-screws engaging clamp 21 and thelower pinching roll and serving in tightening the clamp: 23',1two pairs of links, the outer ends of one pair being ivot'ed to the bending roll and the outer ven s of the other 'air being pivoted to the. lower dpinching roll, the two inks of each pair stra dling the pinion of the appropriate roll: 24, a journal-pin pivotally uniting the inner ends of the-four links: 25, an intermediate pinion carried by this ournal-pin and engaging pinion 201 26, a p nion fast on the bending roll and also engaging the intermediate pinion 25: and 27, the adjusting screws for the bending roll.

hen the parts-are in normal position the saddle16 gives support to thecent-ral portion of the-lower pinching roll and serves in lessening deflection of that roll under the strains of heavy work, and when the rolls are of great pressure, may normally produce some degree of upward deflection for the lower pinching roll, giving to the roll a slight degree of camber to provide for downward deflection under strains of work; 'hen the rolls 'areie be opened, in 'order to remove a roll sheet, the lmckle-bearing is to be unlatched and turned down asusual, andzin thus lrm'ering t he bucklebearing spring 14, which need not have any great amount of initial-tension, aids in coun terbalancing the weight of the heavy bucklebearing. As the buckle-bearing is lowered, the rollers at its toe act cam-like under the outer end of lever 12 and, through link 13, pull down on-the outer endof the extension shaft and, acting lever-like oirthe. upper pinching roll, raises that roll some so as to open the'gap between the two pinching rolls, or at least compensate for the sagging of the unsupported outer end ofthe upper-pinching roll. 'At the same time the saddle-becomes lowered so as to remove any upward deflection which it may have imposed upon th lower pinching roll. By adjusting the link 17 the saddle may be ad'ust'ed to give the desired degree of upwar pressure upon the lower pinching roll I when the parts are in working position.

When the sheet is being rolled to a curve, its lower surface travels faster than its inner surface, and the frictional clamping of the pinion 20 to the lower pinching roll permits rate of surface travel. also eared so as to be driven by power in-' '1' stea friction oft 20 'of a differential travel of the surfaces of the upper and lower pinching rolls. It is to be understood, of course, that inions 19 and 20 will be proportioned accor ing to the diam eters of the upper and lower inching rolls so that the two rolls will normal y have the same The bending roll is of depending for its rotation upon the e sheet being bent, it being found that a non-driven bending roll is sometimes liable to remain stationary while the sheet is passing it, thus resulting in irregular wear of the bending roll, as well as imposing extraor- Qdinary sheet-feeding duty upon the pinchin rolls.- The two pinching rolls are subject to ut small adjustment for distance, between their centers, but the bending roll is subject to a great range of adjustment.- This is rovide for by the expansion gearing i lustrated, the intermediate pinion 25 bein held in engagement with the pinions of the lower pinchlng rolland the bending roll regardless of the adjustment of the latter.

As above stated, if the bending roll be a mere idler, turning by the friction of the passing sheet, the friction may not be sufficient to turn the roll, the result being the wearing of fiat places on the roll, and, as the bending roll 1 is without energy, all of the feeding duty must be assumed by the pinching rolls. 'But, further than this, I have ascertained by practical experience, that in bending sheets to particularly small circles it is referable to do the bending at one pass of t e sheet rather than at several passes. The effect of the bending by the former method I find to be hea advantageous to the resulting molecular structure of the bent metal. The energizing of the three rolls bymeans'of connecting gearing so that one roll acts aggressively on the inner short side of the curving sheet while two rolls act aggressively on its outer side, renthe saddle when the buckle-bearinghis connecting the. short arm .of the lever with the outboard bearing, a pivoted buckle-bearing for the tail end of the top pinching roll, a a

toe carried by the buckle-bearing to engage the long arm ofsaid lever, and a spring acting tension ally between the lever and bucklebearing, combined substantially as set forth.

2. Bendingrolls comprising housings, a top pinching roll, a bottom pinching roll, a head extension snaft for the top pinching roll, an outboard bearing on the extension shaft, a; lever pivoted below the rolls alink connect ing the short arin of the lever with the outboard bearin a pivoted buckle-bearing for the tail end 0 the top inching roll,facurved series of rollers carrie by the buckle-bearing to engage the long arm of said lever, and I a s ring acting tensionallg betweenthelever an buckle-bearing, com ined substantially as set forth. i'

3. Bending rolls comprising housings "la;

top (pinching roll, a bottom pmchmg'roll, a. bee

shaft, a lever pivoted below the rollsga' link connecting the shortarm of the lever. with the outboard bearing, a

ing for the tail end of t a toe carried by the buckle-bearin to engage the long arm of said lever, a sad e disposed. under the lower inching roll at substanhll-lly its center oi length, and connections between said lever and saddle for lowering gaged from the top pinching roll. 4. Ben ling rolls comprising housings hea extension shaft for the top pinching roll, an outboard bearing on tle'extensiore' shaft, a lever pivoted below the rolls, a link ivoted bucklefbeare top pinching roll,

extension shaft for the top pinching roll, an outboard bearing on the extension" top (pinching roll, a bottom pinching roll, a

connecting 'the short arm of the lever withthe outboard bearing, a pivoted buckle-bearing for the tail end of the top pinching roll, a

toe carried by the buckle-bearin to engage the long arm of said lover, a sad e dis )OSGd under substantially the mid-length o the lower enga ing that pinching roll, an anti-deflection ever pivoted 'below'the rolls and carrying said saddle at one of its ends, and an ad-. justable connection between the opposite end of the anti-deflection lever and said first menpinching-roll and provided with rollers e tioned lever, combined substantially as set,

forth. I

5-. Bending roll comprising housings, a top pinching roll, a bottom pinchingroll, means whereby power may be applied to one of said rolls, a pinion fast, on one of said rolls, a pinion loose on the other roll and engaging the first mentioned pinion, Y and means for frictionall y binding the loose pinion to its roll, combined substantially as set forth.

6. Bending rolls comprising housings, a

first pinching roll, a second-pinching roll, a'

bending roll, a first pinio, n the first pinchingroll and engaging the first pinion a third pimon on the bending rolLe hnk pivoted on the bendingroll at each side of the third pinion, a link pivo'ted'on the second pinching roll at each side of the second pinion, a journa-l-pin pivoted in the free ends of the four links, and a fourth pinion carried by ssiid'joiirnal-pin and engagin the first and second pinions, combined su stantially as set forth. 10

CHARLES A. BERTSCH. Witnesses:

LORENZO S. DALE, JOHN C. DODSON. 

